18448091 has 2 divisors, whose sum is σ = 18448092. Its totient is φ = 18448090.

The previous prime is 18448051. The next prime is 18448109. The reversal of 18448091 is 19084481.

Together with next prime (18448109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18448091 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18448051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9224045 + 9224046.

It is an arithmetic number, because the mean of its divisors is an integer number (9224046).

Almost surely, 2^18448091 is an apocalyptic number.

18448091 is a deficient number, since it is larger than the sum of its proper divisors (1).

18448091 is an equidigital number, since it uses as much as digits as its factorization.

18448091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 18448091 is about 4295.1240959954. The cubic root of 18448091 is about 264.2310257706.

The spelling of 18448091 in words is "eighteen million, four hundred forty-eight thousand, ninety-one".